甘肃省肃南县红石拉排铁矿地质特征及找矿方向
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摘要
甘肃省肃南县红石拉排勘查区位于华北板块南缘,北祁连复合造山带内,地层区划属华北地层大区、秦祁昆地层区、祁连-北秦岭地层分区、北祁连地层小区。通过地质工作在测区发现铁矿体3条, Fe1号矿体最大,矿体呈条带状、透镜状,走向约130°,长度约465 m,厚1.50～20 m,TFe品位26.50%～31.63%, mFe品位7.20%～21.61%,产状30°～55°∠35°～70°。矿体厚度变化系数为60%,形态复杂程度中等;产状较稳定,有一定规模的断层,构造复杂程度中等;品位变化系数为4%,有用组分分布均匀程度均匀。含矿岩性为磁铁石英岩、蚀变绢云母石英片岩,呈条带状、透镜状,局部地段矿体有膨大缩小、尖灭在现现象。矿床成因初步确定为(火山)沉积-变质型铁矿。
The Hongshilapai exploration area in Sunan County, Gansu Province is located in the southern margin of North China plate and in the North Qilian composite orogenic belt. Its stratigraphic division belongs to the North China Stratigraphic Region, Qinqikun Stratigraphic Region, Qilian-North Qinling Stratigraphic Division and North Qilian Stratigraphic Area.Through geological work, three iron ore bodies were found in the survey area. Fe1 orebody is the largest. The orebody is strip-like and lenticular. Its strike is about 130 degrees, its length is about 465 m, its thickness is 1.50～20 m, its TFe grade is 26.50%～31.63%, its mFe grade is 7.20%～21.61%, and its occurrence is 30°～55°∠35°～70°. The variation coefficient of ore body thickness is 60%, the complexity of ore body shape is moderate; the occurrence is relatively stable, there are certain scale faults, and the structure complexity is moderate; the grade variation coefficient is 4%, and the distribution of useful components is uniform. The ore-bearing lithology is magnetite quartzite and altered sericite quartz schist, which is banded and lenticular. In some areas, the ore bodies are enlarged, narrowed and pinched out.The genesis of the deposit is preliminarily determined as(volcanic) sedimentary-metamorphic iron ore.
The Hongshilapai exploration area in Sunan County, Gansu Province is located in the southern margin of North China plate and in the North Qilian composite orogenic belt. Its stratigraphic division belongs to the North China Stratigraphic Region, Qinqikun Stratigraphic Region, Qilian-North Qinling Stratigraphic Division and North Qilian Stratigraphic Area.Through geological work, three iron ore bodies were found in the survey area. Fe1 orebody is the largest. The orebody is strip-like and lenticular. Its strike is about 130 degrees, its length is about 465 m, its thickness is 1.50～20 m, its TFe grade is 26.50%～31.63%, its mFe grade is 7.20%～21.61%, and its occurrence is 30°～55°∠35°～70°. The variation coefficient of ore body thickness is 60%, the complexity of ore body shape is moderate; the occurrence is relatively stable, there are certain scale faults, and the structure complexity is moderate; the grade variation coefficient is 4%, and the distribution of useful components is uniform. The ore-bearing lithology is magnetite quartzite and altered sericite quartz schist, which is banded and lenticular. In some areas, the ore bodies are enlarged, narrowed and pinched out.The genesis of the deposit is preliminarily determined as(volcanic) sedimentary-metamorphic iron ore.
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